/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.preverify;

import proguard.Configuration;
import proguard.classfile.*;
import proguard.classfile.attribute.visitor.AllAttributeVisitor;
import proguard.classfile.visitor.*;

/**
 * This class can preverify methods in program class pools, according to a given configuration.
 *
 * @author Eric Lafortune
 */
public class Preverifier {
    private final Configuration configuration;

    /**
     * Creates a new Preverifier.
     */
    public Preverifier(Configuration configuration) {
        this.configuration = configuration;
    }

    /**
     * Performs preverification of the given program class pool.
     */
    public void execute(ClassPool programClassPool) {
        // Clean up any old visitor info.
        programClassPool.classesAccept(new ClassCleaner());

        // Preverify all methods.
        // Classes for JME must be preverified.
        // Classes for JSE 6 may optionally be preverified.
        // Classes for JSE 7 or higher must be preverified.
        programClassPool.classesAccept(new ClassVersionFilter(
            configuration.microEdition ? ClassConstants.CLASS_VERSION_1_0 : ClassConstants.CLASS_VERSION_1_6,
            new AllMethodVisitor(new AllAttributeVisitor(new CodePreverifier(configuration.microEdition)))));
    }
}
